Government organizations such as OSHA have set recommended heat stress limits for
various activities. Continually monitors all heat stress indicators. Recalls min/max temperature
and provides visual alarms for user selectable hi/lo temperature thresholds, (+ RH for model 800034).
Datalogging Model 800035 adds an audible temperature alarm, and records up to 32,000 data points
that can be downloaded using the USB cable that comes with the unit and free downloadable software.
Both models include 4 AAA batteries and stand on a desk-top or wall mount. An AC Adapter (800059)
is included with Datalogger 800035 and available as an optional accessory for Monitor 800034.

Heat stress results from a combination of many environmental factors – air temperature and humidity along with radiant heat from the sun and surfaces,
balanced by the cooling effect of breezes or air flow. OSHA is campaigning to prevent heat illness in workers and reports that every year thousands of workers become sick
working in the heat, and some even die. Accurate measurements of heat stress conditions is a key component of a heat illness prevention plan. To prevent injury it is a good idea to
have heat stress monitors in place. Heat stress monitors determine the level of heat stress as a result of a combination of external heat exposure from the environment.
When the heat stress index becomes too high, the monitor will register the heat level as dangerous.

Dimensions: 4½" × 4¼" × 1" (108 × 115 × 25 mm)
Weight: 5 oz (141 g)

Specifications

Range

Resolution

Accuracy

Air Temperature:

-20 to 50°C-4 to 121°F

0.1°C / F

±0.6°C / ±1.2°F

RH:

0.0 to 99.9%

0.1%

±3% FS @25°C

Standards

Heat Index

Risk Level

Protective Measures

< 91°F

Lower (Caution)

 Provide drinking water
 Ensure that adequate medical services are available
 Plan ahead for times when heat index is higher, including worker heat safety training
 Encourage workers to wear sunscreen

If workers must wear heavy protective clothing, perform strenuous activity or work in the direct sun, additional precautions are recommended to protect workers from heat-related illness.*

91°F to 103°F

Moderate

In addition to the steps listed above:

 Remind workers to drink water often (about 4 cups/hour)**
 Review heat-related illness topics with workers: how to recognize heat-related illness, how to prevent it, and what to do if someone gets sick
 Schedule frequent breaks in cool, shaded area
 Acclimatize workers
 Set up buddy system/instruct supervisors to watch workers for signs of heat-related illness

If workers must wear heavy protective clothing, perform strenuous activity or work in the direct sun, additional precautions are recommended to protect workers from heat-related illness.*

 Schedule activities at a time when the heat index is lower
 Develop work/rest schedules
 Monitor workers closely

103°F to 115°F

High

In addition to the steps listed above:

 Alert workers of high risk conditions
 Actively encourage workers to drink plenty of water (about 4 cups/hour)**
 Limit physical exertion (e.g. use mechanical lifts)
 Have a knowledgeable person at the worksite who is well-informed about heat-related illness and able to determine appropriate work/rest schedules
 Establish and enforce work/rest schedules
 Adjust work activities (e.g., reschedule work, pace/rotate jobs)
 Use cooling techniques
 Watch/communicate with workers at all times

When possible, reschedule activities to a time when heat index is lower

> 115°F

Very Highto Extreme

Reschedule non-essential activity for days with a reduced heat index or to a time when the heat index is lower

Move essential work tasks to the coolest part of the work shift; consider earlier start times, split shifts, or evening and night shifts.

Strenuous work tasks and those requiring the use of heavy or non-breathable clothing or impermeable chemical protective clothing should not be conducted when the heat index is at or above 115°F.

If essential work must be done, in addition to the steps listed above:

*The heat index is a simple tool and a useful guide for employers making decisions about protecting workers in hot weather. It does not account for certain conditions that contribute additional risk, such as physical exertion. Consider taking the steps at the next highest risk level to protect workers from the added risks posed by:

 Working in the direct sun (can add up to 15°F to the heat index value)
 Wearing heavy clothing or protective gear

**Under most circumstances, fluid intake should not exceed 6 cups per hour or 12 quarts per day. This makes it particularly important to reduce work rates, reschedule work, or enforce work/rest schedules.

Sper Scientific warrants this product against defects in materials and workmanship for a the stated period from the date of purchase, and agrees to repair or replace any defective unit without charge. If your model has since been discontinued, an equivalent Sper Scientific product will be substituted if available. This warranty does not cover probes, batteries, or damage resulting from accident, misuse, or abuse.
Opening the meter to expose its electronics will break the waterproof seal and void the warranty.